54. The correct sequence in the conduction system of the heart is A. Purkinje fi

Question

54. The correct sequence in the conduction system of the heart is A. Purkinje fibers, AV bundle, bundle branches. B. AV node, SA node, Purkinje fibers. C. SA node, AV node, AV bundle, bundle branches, Purkinje fibers D. AV node, bundle branches, SA node, Purkinje fibers. 55. What structural component of cardiac muscle cells allows for electrical current to flow from cell? A. tight junctions B. gap junctions C. adhesion junction 56. An area other than the SA node can become the pacemaker. This area is called afan) A. heart block. B. intrinsic conduction system. C. ectopic pacemaker. D. interventricular septum. 57. In an ECG, the P wave represents A. depolarization of the atria. B. depolarization of the ventricles. C. repolarization of the atria. D. repolarization of the ventricles. 58. In an ECG, the QRS complex represents A. depolarization of the atria. B. depolarization of the ventricles.

Explanation / Answer

54.(C) SA node - AV naode- av bundle -bundle fibres - purkinjee fibres

The conduction system of the heart. Left: Normal excitation originates in the sinoatrial(SA) node then propagates through both atria. The atrial depolarization spreads to theatrioventricular (AV) node, and passes through the bundle of His to the bundle branches/Purkinje fibers.

55. (B) gap junction.

The primary structural components of cardiac muscle cells; which allow for electrical current to flow from cell to cell.

56.c) ectopic pacemaker

An ectopic pacemaker is an excitable group of cells that causes a premature heart beat outside the normally functioning SA node of the heart.

57.a) depolarisation of atria

In ECG,The first deflection is the P wave associated with right and left atrial depolarization.

58.b) depolarisation of ventricles

The next wave to P wave  is called the QRS wave. This wave is much larger than the P wave, and itrepresents the depolarization of the ventricles.

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